Last year I bought a Jex 700 Electronic starting gun to replace our normal starting pistol. Cost of shells going up. Needless to say that it would not start the timing system even with the sensor right on top of the speaker. I opened it up and probed around with a ohmmeter to see if I could jumper it off to radiolynx. I found two unused pins on the main chip that created a connection that will work with radiolynx.
Attached is a picture of the solder points on the board. This might help those that what to go electronic and want to do it on the cheap.
I only need to do a zero test.
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